:root {
            --primary-color: #1a73e8;
            --primary-light: #e8f0fe;
            --secondary-color: #5f6368;
            --background-color: #c1dffd;
            --card-color: #ffffffcc;
            --text-color: #202124;
            --border-color: #dadce0;
            --gold: #ffc107;
            --silver: #c0c0c0;
            --bronze: #cd7f32;
            --trend-up: #34a853;
            --trend-down: #ea4335;
            --trend-new: #1a73e8;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            background-color: var(--background-color);
            color: var(--text-color);
            line-height: 1.6;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
        }

        header {
            text-align: center;
            margin-bottom: 30px;
            padding: 20px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .container h1 {
            color: var(--primary-color);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }

        .description {
            color: var(--secondary-color);
            max-width: 600px;
            margin: 0 auto;
        }

        .main-content {
            display: flex;
            gap: 20px;
        }

        .category-nav {
            flex: 0 0 250px;
            background: var(--card-color);
            border-radius: 12px;
            padding: 20px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
            height: fit-content;
            position: sticky;
            top: 20px;
        }

        .category-title {
            font-weight: 600;
            margin-bottom: 15px;
            color: var(--primary-color);
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .category-title i {
            font-size: 1.1rem;
        }

        .category-section {
            margin-bottom: 20px;
        }

        .category-section:last-child {
            margin-bottom: 0;
        }

        .category-section-title {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--secondary-color);
            margin-bottom: 10px;
            padding-left: 5px;
            border-left: 3px solid var(--primary-color);
            padding-left: 10px;
        }

        .category-list {
            list-style: none;
        }

        .category-item {
            padding: 10px 12px;
            margin-bottom: 5px;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.2s;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.95rem;
        }

        .category-item:hover {
            background-color: var(--primary-light);
        }

        .category-item.active {
            background-color: var(--primary-light);
            color: var(--primary-color);
            font-weight: 500;
        }

        .category-item i {
            width: 18px;
            text-align: center;
            font-size: 0.9rem;
        }

        .content-area {
            flex: 1;
        }

        .platform-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            background: var(--card-color);
            padding: 15px 20px;
            border-radius: 12px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
        }

        .platform-title {
            font-size: 1.5rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .platform-icon {
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-light);
            border-radius: 8px;
            color: var(--primary-color);
        }

        .update-time {
            color: var(--secondary-color);
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .hot-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 20px;
        }

        .hot-card {
            background: var(--card-color);
            border-radius: 12px;
            padding: 18px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            transition: transform 0.2s, box-shadow 0.2s;
            position: relative;
            overflow: hidden;
        }

        .hot-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
        }

        .hot-card.rank-1 {
            border-top: 4px solid var(--gold);
        }

        .hot-card.rank-2 {
            border-top: 4px solid var(--silver);
        }

        .hot-card.rank-3 {
            border-top: 4px solid var(--bronze);
        }

        .hot-rank {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 28px;
            height: 28px;
            text-align: center;
            line-height: 28px;
            border-radius: 6px;
            background-color: var(--primary-color);
            color: white;
            font-size: 0.85rem;
            font-weight: 600;
            margin-right: 10px;
        }

        .hot-rank.rank-1 {
            background-color: var(--gold);
        }

        .hot-rank.rank-2 {
            background-color: var(--silver);
        }

        .hot-rank.rank-3 {
            background-color: var(--bronze);
        }

        .hot-header {
            display: flex;
            align-items: flex-start;
            margin-bottom: 12px;
        }

        .hot-title {
            font-weight: 500;
            flex: 1;
            line-height: 1.4;
        }

        .hot-link {
            text-decoration: none;
            color: var(--text-color);
            display: block;
        }

        .hot-link:hover {
            color: var(--primary-color);
        }

        .hot-trend {
            display: inline-flex;
            align-items: center;
            font-size: 0.8rem;
            padding: 2px 6px;
            border-radius: 4px;
            margin-left: 8px;
            font-weight: 500;
        }

        .trend-up {
            background-color: rgba(52, 168, 83, 0.1);
            color: var(--trend-up);
        }

        .trend-down {
            background-color: rgba(234, 67, 53, 0.1);
            color: var(--trend-down);
        }

        .trend-new {
            background-color: rgba(26, 115, 232, 0.1);
            color: var(--trend-new);
        }

        .hot-value {
            color: var(--secondary-color);
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .hot-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 10px;
            padding-top: 10px;
            border-top: 1px solid var(--border-color);
        }

        .loading {
            text-align: center;
            padding: 60px 20px;
            color: var(--secondary-color);
            grid-column: 1 / -1;
        }

        .loading-spinner {
            display: inline-block;
            width: 40px;
            height: 40px;
            border: 4px solid rgba(26, 115, 232, 0.2);
            border-radius: 50%;
            border-top-color: var(--primary-color);
            animation: spin 1s ease-in-out infinite;
            margin-bottom: 15px;
        }

        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }

        .error {
            text-align: center;
            padding: 60px 20px;
            color: #d93025;
            grid-column: 1 / -1;
        }

        .error-icon {
            font-size: 3rem;
            margin-bottom: 15px;
            color: #d93025;
        }

        footer {
            text-align: center;
            margin-top: 50px;
            padding: 25px 0;
            color: var(--secondary-color);
            font-size: 0.9rem;
            border-top: 1px solid var(--border-color);
        }

        @media (max-width: 1100px) {
            .hot-list {
                grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            }
        }

        @media (max-width: 768px) {
            .main-content {
                flex-direction: column;
            }

            .category-nav {
                flex: none;
                margin-bottom: 20px;
                position: static;
            }

            .hot-list {
                grid-template-columns: 1fr;
            }

            .platform-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }
        }